How can I search a value in all lines of matrix?

Question

I want to find the value that I entered the first in array, in the matrix. So, for example my first value of array 5, I want to search 5 in matrix using function. But, if I enter the 5 value in the first line of matrix, the code is finding the 5, there aren't problem here. But if I enter the 5 value in second line or third... line my code can't find this value. Where am I doing the mistake in my code. I thought this is relevant "a" in the for loop but I couldn't find the problem there. Thank you.

#include <stdio.h>
#include <stdlib.h>

void functionmatrix1(int startingvalue1,
                     int thematrixthatwillthrowtofunction1[][100],
                     int linevalue1, int columnvalue1)
{
    int a = 0, b = 0;
    int counter1 = 0;
    for (a = 0; a < linevalue1; a++) {
        for (b = 0; b < columnvalue1; b++) {
            if (startingvalue1 == thematrixthatwillthrowtofunction1[a][b]) {
                printf("The array was found in [%d %d] \n", a, b);
                counter1++;
            }
        }
    }
    if (counter1 == 0) {
        printf("There aren't in matrix'");
    }
    printf("%d", counter1);
    printf("%d", a);
}

int main() {
    int matrixLine, matrixColumn;
    int i, k, s;
    
    printf("Enter matrix line and column with the queue:");
    scanf("%d %d", &matrixLine, &matrixColumn);
    
    int matrix[matrixLine][matrixColumn];
    
    for (i = 0; i < matrixLine; i++) {
        for (k = 0; k < matrixColumn; k++) {
            printf("Enter %d. line %d. column value of matrix:", i, k);
            scanf("%d", &matrix[i][k]);
            
            while (matrix[i][k] > 99 || matrix[i][k] < -99) {
                printf("The elements of matrix can be the most 2 digits, please enter new value :");
                scanf("%d", &matrix[i][k]);
            }
        }
    }
    int sizeofarray;
    printf("Enter the size of the array:");
    scanf("%d", &sizeofarray);
        
    int sizeofarray1[sizeofarray];
        
    printf("Enter the array that will searched:");
    for (s = 0; s < sizeofarray; s++) {
        printf("Enter the %d. element of array:", s + 1);
        scanf("%d", &sizeofarray1[s]);
    }
    functionmatrix1(sizeofarray1[0], matrix, matrixLine, matrixColumn);
    return 0;
}

Answer 1

Unless the user enters exactly 100 for the matrix column number, the VLA matrix passed to the function does not have the expected dimensions.

You should modify the function prototype this way:

#include <stdio.h>

int functionmatrix1(int value, int lines, int columns, int mat[lines][columns]) {
    int count = 0;
    for (int a = 0; a < lines; a++) {
        for (int b = 0; b < columns; b++) {
            if (value == mat[a][b]) {
                printf("The value %d was found in [%d %d]\n", value, a, b);
                count++;
            }
        }
    }
    if (count == 0) {
        printf("Value %d in not in the matrix\n", value);
    } else {
        printf("Value %d was found %d times\n", value, count);
    }
    return count;
}

int main() {
    int matrixLines, matrixColumns;
    
    printf("Enter matrix line and column numbers with the queue:");
    if (scanf("%d %d", &matrixLines, &matrixColumns) != 2)
        return 1;

    int matrix[matrixLines][matrixColumns];
    
    for (int i = 0; i < matrixLines; i++) {
        for (int k = 0; k < matrixColumns; k++) {
            printf("Enter %d. line %d. column value of matrix:", i, k);
            if (scanf("%d", &matrix[i][k]) != 1)
                return 1;
            
            while (matrix[i][k] > 99 || matrix[i][k] < -99) {
                printf("The elements of matrix can be the most 2 digits, please enter new value: ");
                if (scanf("%d", &matrix[i][k]) != 1)
                    return 1;
            }
        }
    }
    int sizeofarray;
    printf("Enter the size of the array:");
    if (scanf("%d", &sizeofarray) != 1)
        return 1;
        
    int array1[sizeofarray];
        
    printf("Enter the array that will searched:");
    for (int s = 0; s < sizeofarray; s++) {
        printf("Enter the element %d of array: ", s);
        if (scanf("%d", &array1[s]) != 1)
            return 1;
    }
    for (int s = 0; s < sizeofarray; s++) {
        functionmatrix1(array1[s], matrixLines, matrixColumns, matrix);
    }
    return 0;
}